West Attica is one of the regional units of Greece. It is part of the region of Attica. The capital of the regional unit is the town of Elefsina. The regional unit covers the western part of the agglomeration of Athens

Athens

Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state...

, and the area to its west.

Administration

The regional unit West Attica is subdivided into 5 municipalities. These are (number as in the map in the infobox):

• Aspropyrgos
  Aspropyrgos
  Aspropyrgos is a suburb of Athens, and a municipality in the West Attica regional unit, Attica, Greece. It is located 20 km NW of the city center of Athens in the Thriasian plain...
  
   (2)
• Elefsina (1)
• Fyli
  Fyli
  Fyli is a town and a municipality in the northwestern part of Attica, Greece. It lies in the northeastern corner of the West Attica regional unit, and is a suburb of Athens...
  
   (5)
• Mandra-Eidyllia (3)
• Megara
  Megara
  Megara is an ancient city in Attica, Greece. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis, which belonged to Megara in archaic times, before being taken by Athens. Megara was one of the four districts of Attica, embodied in the four mythic sons of King...
  
   (4)

Prefecture

As a part of the 2011 Kallikratis government reform, the regional unit West Attica was created out of the former prefecture

Prefectures of Greece

During the first administrative division of independent Greece in 1833–1836 and then again from 1845 until their abolition with the Kallikratis reform in 2010, the prefectures were the country's main administrative unit...

 West Attica . The prefecture had the same territory as the present regional unit. At the same time, the municipalities were reorganised, according to the table below.

New municipality	Old municipalities	Seat
Aspropyrgos Aspropyrgos Aspropyrgos is a suburb of Athens, and a municipality in the West Attica regional unit, Attica, Greece. It is located 20 km NW of the city center of Athens in the Thriasian plain...	Aspropyrgos Aspropyrgos Aspropyrgos is a suburb of Athens, and a municipality in the West Attica regional unit, Attica, Greece. It is located 20 km NW of the city center of Athens in the Thriasian plain...	Aspropyrgos
Elefsina	Elefsina	Elefsina
	Magoula Magoula, Attica Magoula is a town and former community of West Attica, Greece. Since the 2011 local government reform it is part of the municipality Elefsina, of which it is a municipal unit....
Fyli Fyli Fyli is a town and a municipality in the northwestern part of Attica, Greece. It lies in the northeastern corner of the West Attica regional unit, and is a suburb of Athens...	Fyli Fyli Fyli is a town and a municipality in the northwestern part of Attica, Greece. It lies in the northeastern corner of the West Attica regional unit, and is a suburb of Athens...	Ano Liosia
	Ano Liosia Ano Liosia Ano Liosia is a suburb and a former municipality in the northern part of the Athens agglomeration, Greece. Since the 2011 local government reform it is part of the municipality Fyli, of which it is the seat and a municipal unit....
	Zefyri Zefyri Zefyri is a suburb and former municipality in West Attica, Greece. Since the 2011 local government reform it is part of the municipality Fyli, of which it is a municipal unit....
Mandra-Eidyllia	Mandra Mandra Mandra , is a town and municipality in the central part of West Attica, Greece. Since the 2011 local government reform it is part of the municipality Mandra-Eidyllia, of which it is the seat and a municipal unit.Mandra is part of the Athens metropolitan area...	Mandra
	Erythres Erythres Erythres known as Κριεκούκι Kriekouki "red-head" in Arvanitika, perhaps named after an Arvanite leader; ) is a village and a former municipality in the northernmost part of West Attica, Greece. Since the 2011 local government reform it is part of the municipality Mandra-Eidyllia, of which it is a...
	Oinoi Oinoi Oinoi is a village and a former community in the northern part of West Attica, Greece. Since the 2011 local government reform it is part of the municipality Mandra-Eidyllia, of which it is a municipal unit....
	Vilia Vilia Vilia is a village and a former municipality of West Attica, Greece. Since the 2011 local government reform it is part of the municipality Mandra-Eidyllia, of which it is a municipal unit....
Megara Megara Megara is an ancient city in Attica, Greece. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis, which belonged to Megara in archaic times, before being taken by Athens. Megara was one of the four districts of Attica, embodied in the four mythic sons of King...	Megara Megara Megara is an ancient city in Attica, Greece. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis, which belonged to Megara in archaic times, before being taken by Athens. Megara was one of the four districts of Attica, embodied in the four mythic sons of King...	Megara
	Nea Peramos Nea Peramos Nea Peramos -Geography:Nea Peramos is situated in the eastern portion of the Megaris plain, in the northwestern part of the agglomeration of Athens. Mountains are situated to the north, and the Saronic Gulf to the south. Nea Peramos offers a panorama of the island of Salamis...

Provinces

The prefecture of West Attica was subdivided into two provinces

Provinces of Greece

The provinces of Greece were sub-divisions of some the country's prefectures. From 1887, the provinces were abolished as actual administrative units, but were retained for some state services, especially finance services and education, as well as for electoral purposes...

: the Province of Megaris (capital Megara), and the Province of Eleusis (capital Elefsina). They were abolished before the Kallikratis programme came into effect.